Method of repairing engine cylinders



Jan. 26, 1932. H. J. YOUNT 42 METHOD OF REPAIRING ENGINE CYLINDERS Filed Nov. 6. 1929 T' 4 cL I w 'l' 4 L w i v llll 1/ If 5 I I b 5 5 b 5 1j 1 Q l \i 7 INVENTOR.

Horace J. Younf "W mm ATTORNEY.

use. The shell has port holes and 6 6 atenteol Jamh, 1932 HORACE J.YOUNT, OF INDIANAPOLIS, INDIANA; CATHEBINERUTH YOUNT, ADMINIS- TRATRIXOI! SAID HORACE J. YOUNT, DECEASED, ASSIGNORJBY M'ESNE ASSIGN- HIETHODOF REPAIRING ENGINE CYLINDERS INCORPORATED, OF INDIANAPOLIS,

1. tart- Application filed November 6, 1929. Serial No. 405,069.,

It frequently happens that the cylinders of internal combustion enginesbecome worn, scored or cracked in use, heretofore requiring areplacement of the cylinder and as there are commonly a plurality ofcylinders in a unitary casting of such engines, making a replacement ofall of them necessary, the resulting expense is high. v

The object of this invention is to repair worn, scored and crackedcylinders by bore ing them larger and inserting a cast metal lining orshell having cored-out parts to register and correspond with those ofthe cylthe introduction of a repair shell is just be- Fig. 2 is alongitudinal section on the line Y 2-2 of Fig. 1; and

Fig. 3 is a transverse section on the llne 3-3 of Fig. 1.

Like characters of reference indicate like parts in the several views ofthe drawings.

A cylinder 4, may be of any usual and suitable construction, the typehere shownhaving a single port 5, through one side of its wall and apair of ports 6, 6, through the wall diametrically opposite; butthat-will vary in different engine types. The cylinder is surrounded bythe usual Water-j acket 7.

A. crack, wear or score in the cylinder, here shown at 8, is to beclosed by the aid of my invention, which comprises the'reboring of thecylinder 4, to a diameter sufficiently enlarged to receive a metallining or shell 8.

The shell 8 is preferably formed of cast ironwhich is initially thickerin both out side and inside diameters for-.machining to the exactdimensions which are required for corresponding in all respects as tosize, shape, and location, with the respective ports 5 and t3, 6, of thecylinder. Thus, when the shell is assembled in the cylinder the severalport openings will exactly register.

The cast shells 8 are turned down on the outside, preferably to astandard diameter, in order that they may be made in quantities and keptin stock for quick delivery as needed, and the exact outside measurementknown in advance by the mechanic ordering 1t, thereby enabling him toproceed with the reboring of the cylinder while the she'll for thisparticular type and size of engine is in transit from a supply house.

The cylinder is rebored to a diameter which will receive the shell witha tight sliding fit, under pressure, in order to hold the assemblywithout other fastening means; The inner edge of the shell farthest fromthe ports is chamfered to receive the piston (not shown) with thegreatest freedom, and a longitudinal line w-b is scored into the outsidefinished surface of the shell.

The end of the cylinder is formed with an indent 0; located by carefulmeasurement, to indicate, by placing the line ar -b opposite it, wherethe shell must be positioned at the beginning ofits installation, andthe line and indent are kept together until the installation iscomplete, to insure the proper registration of the ports of the shellwith those of the cylinder.

The length of the shell is just right to bring the ports into properregister when the outer end of the shell has moved until it is flushwith the end of the'cylinder.

After the shell is finally positioned in the cylinder, the insidediameter of the shell is formed by grinding or other suitable means tofit the piston that is to be used with that job. To enable this to bedone the inside diameter is left purposely smaller than it will be inthe finished product.

I claim:

The method of. repairing a worn gas engine cylinder which comprisescutting the cylinder to a uniform diameter greater than its initialstandard diameter, forming a tubular sleeve with an initial externaldiameter iiitl exceeding that of the greatest diameter to which saidcylinder may safely becut and With an internal diameter less than thestandard diameter of the c linder, cutting the 5 sleeve externally to reuce its diameter to near that of the enlarged'cylinder to provide for aforce fit, pressing the sleeve. into the enlarged cylinder, and cuttingthe sleeve internally to a standard diameter for the cyl- 1 inder,

In testimony whereof I affix my signature.

HORACE J. YQUNT.

